xref: /netbsd-src/external/gpl2/groff/dist/src/libs/libbib/map.c (revision 89a07cf815a29524268025a1139fac4c5190f765)
1 /*	$NetBSD: map.c,v 1.1.1.1 2016/01/13 18:41:48 christos Exp $	*/
2 
3 /* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2001, 2004
4    Free Software Foundation, Inc.
5      Written by James Clark (jjc@jclark.com)
6 
7 This file is part of groff.
8 
9 groff is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 2, or (at your option) any later
12 version.
13 
14 groff is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
17 for more details.
18 
19 You should have received a copy of the GNU General Public License along
20 with groff; see the file COPYING.  If not, write to the Free Software
21 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
22 
23 #include <stdlib.h>
24 
25 #ifdef HAVE_CONFIG_H
26 #include <config.h>
27 #endif
28 
29 #ifdef HAVE_MMAP
30 
31 #include <sys/types.h>
32 #include <sys/mman.h>
33 
34 /* The Net-2 man pages says that a MAP_FILE flag is required. */
35 #ifndef MAP_FILE
36 #define MAP_FILE 0
37 #endif
38 
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42 
mapread(int fd,int nbytes)43 char *mapread(int fd, int nbytes)
44 {
45   char *p = (char *)mmap((void *)0, (size_t)nbytes, PROT_READ,
46 			 MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
47   if (p == (char *)-1)
48     return 0;
49   /* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
50   if (p == 0)
51     abort();
52   return p;
53 }
54 
unmap(char * p,int len)55 int unmap(char *p, int len)
56 {
57   return munmap((void *)p, len);
58 }
59 
60 #ifdef __cplusplus
61 }
62 #endif
63 
64 #else /* not HAVE_MMAP */
65 
66 #include <errno.h>
67 
68 #ifdef __cplusplus
69 extern "C" {
70 #endif
71 
mapread(int fd,int nbytes)72 char *mapread(int fd, int nbytes)
73 {
74   errno = ENODEV;
75   return 0;
76 }
77 
unmap(char * p,int len)78 int unmap(char *p, int len)
79 {
80   errno = EINVAL;
81   return -1;
82 }
83 
84 #ifdef __cplusplus
85 }
86 #endif
87 
88 #endif /* not HAVE_MMAP */
89